2017, VOLUME 4 ISSUE 3Pages: 419-420
Rice brown spot Bipolaris oryzae (Breda de Haan) Shoemaker in Paraguay
Lidia Quintana*, Susana Gutiérez, Manuela Arriola, Karina Morinigo and Aldo Ortiz
*Facultad de Ciencias Agropecuariasy Forestales-Universidad Nacional de Itapúa Encarnación, Paraguay
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Brown leaf spot is a serious disease in rice production worldwide, caused by Bipolaris oryzae (Breda de Haan) Shoemaker, it is caused losses in stand due to seedling blight, in yield due to leaf and culm infection, and in quality and yield by kernel infection. In the 2014/2015 season, disease survey was conducted in the different rice-growing area of the country. Symptoms were observed on rice plants of IRGA 424 cultivar as leaf spot throughout the growing season, mostly on leaf blade and leaf sheath. Small spots were dark brown to reddish brown, circular to oval in shape, while older spots have a light, reddish-brown or gray center surrounded by a dark to reddish-brown margin.
Fig.: A–B, Symptoms of brown spot on rice leaves; C, Conidia of Bipolaris oryzae (Breda de Haan) Shoemaker.